dorsal/arxiv
View SchemaQ^2-Dependence of the Drell-Hearn-Gerasimov integral
| Authors | O. Scholten, A. Yu. Korchin |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9905004 |
| URL | https://arxiv.org/abs/nucl-th/9905004 |
| Journal | Eur.Phys.J. A6 (1999) 211-214 |
Abstract
The energy and four-momentum (Q^2) dependence of the photo-absorption cross section on the proton is calculated for helicity -1/2 and -3/2 states. An effective Lagrangian model is used, formulated in terms of meson and baryon degrees of freedom, which obeys crossing symmetry, unitarity, Lorentz and gauge invariance. The difference in the cross sections for the two helicity states, the Drell-Hearn-Gerasimov integral $I_{DHG}(Q^2)$, is evaluated at different $Q^2$. We find that at small momentum transfer the absolute value of $I_{DHG}(Q^2)$ first increases to reach a maximum at $Q^2 \approx 0.05 GeV^2$ before decreasing at higher $Q^2$.
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"abstract": "The energy and four-momentum (Q^2) dependence of the photo-absorption cross\nsection on the proton is calculated for helicity -1/2 and -3/2 states. An\neffective Lagrangian model is used, formulated in terms of meson and baryon\ndegrees of freedom, which obeys crossing symmetry, unitarity, Lorentz and gauge\ninvariance. The difference in the cross sections for the two helicity states,\nthe Drell-Hearn-Gerasimov integral $I_{DHG}(Q^2)$, is evaluated at different\n$Q^2$. We find that at small momentum transfer the absolute value of\n$I_{DHG}(Q^2)$ first increases to reach a maximum at $Q^2 \\approx 0.05 GeV^2$\nbefore decreasing at higher $Q^2$.",
"arxiv_id": "nucl-th/9905004",
"authors": [
"O. Scholten",
"A. Yu. Korchin"
],
"categories": [
"nucl-th"
],
"journal_ref": "Eur.Phys.J. A6 (1999) 211-214",
"title": "Q^2-Dependence of the Drell-Hearn-Gerasimov integral",
"url": "https://arxiv.org/abs/nucl-th/9905004"
},
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